Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3f897a6fd1726f…

MALICIOUS

PDF

46.5 KB Created: 2020-08-29 17:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 112ffb9c34c68c5c331b8b6a79e0873f SHA-1: 4830466b421598ec12934886f52abb3f8e952dc9 SHA-256: af3f897a6fd1726f91adf18a09352e0342ce2746dc174561c14a6ecf067fa808
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm designed to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.club'. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a social engineering lure to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.club/wix?keyword=star+wars+aftermath+empire%2527s+end+audiobook
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/chander_pahar_full_movie_300mb.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1144/files/83517008783.pdf
    • https://cdn.shopify.com/s/files/1/0438/4666/4349/files/math_grade_7_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c881a4cdd3a48caac3f3699895b18b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_4263e917e5ab430bbce7e8548f6d2abe.pdf
    • https://static.usrfiles.com/ugd/66c878_7f751180020045dc817a3de4f0f87fd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9878380b4589458a9e397987f4a737ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_c37b508b33804118a6a1ab87f195e5c6.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d06ffd7ee54146a207f73ea5f90603.pdf
    • https://static.usrfiles.com/ugd/ace02d_b8fdd1b5894a4d719640f86695d6a0d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_31e591a6907047dc93217a5834b16001.pdf
    • https://static.usrfiles.com/ugd/24853a_8110ed30fdb746faa2482c980f91c546.pdf
    • https://static.usrfiles.com/ugd/b58d21_a2c2eedef64e4ba7bc72fb66de935e8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbe20edb33504164a06ec4f080f0863d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e4.bin
c5744b283218dc8a84711158796543ff37c17216bce560d80deae0cf3e0fdc89
pdf-font-stream PDF embedded font (sfnt) at offset 0x76E4 5684 bytes
font_01_sfnt_off00008a1e.bin
8b9a5880057fd917cb47340eeb980d27d11db8f95f8c250f11eb0e7f0ff48f41
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1E 10076 bytes